US 10,865,902 B2 · Flow-rate control valve · patentgrep

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Abstract

A valve unit is moveably accommodated in a valve housing having a valve seat. A coil spring is provided at an outer periphery of the valve unit to bias the valve unit in an axial direction of absorbing a backlash between a driving-side screw portion of a driving portion and a valve-side screw portion of the valve unit. Pressure losses of fluid at respective portions are so made to satisfy a relationship of “P0≥P1≥P2”, wherein “P0” is a pressure loss of the fluid passing through an outlet port, “P1” is a pressure loss of the fluid passing through an axial space formed between the valve unit and the valve seat in a condition that the valve unit is most separated from the valve seat, and “P2” is a pressure loss of the fluid passing through an axial gap formed between neighboring spring wire portions or passing through an axial gap formed between the coil spring and the valve seat.

Claims11

Dependent claims

A flow-rate control valve comprising:

a valve housing having;
(1a) a first fluid passage connected to a vaporized-fuel inlet port;
(1b) a second fluid passage connected to a vaporized-fuel outlet port;
(1c) a fluid flow path through which fluid flows from the first fluid passage to the second fluid passage;
and
(1d) a connecting space formed in the fluid flow path and operatively connecting the first fluid passage to the second fluid passage;
a valve unit movably accommodated in the valve housing in such a manner that the valve unit is operatively brought into contact with a valve seat formed in the valve housing or separated from the valve seat, wherein the valve unit closes the connecting space to prohibit a fluid flow through the connecting space or opens the connecting space to allow the fluid flow therethrough;
a driving portion for driving the valve unit in an axial direction of the valve housing in such a manner that the valve unit is reciprocated between a valve closed position and a valve opened position, wherein the valve unit is brought into contact with the valve seat in the valve closed position and separated from the valve seat in the valve opened position;
a driving-side screw portion formed in the driving portion;
a valve-side screw portion formed in the valve unit and engaged with the driving-side screw portion;
and
a coil spring provided in the fluid flow path of the connecting space and biasing the valve unit in the axial direction for absorbing a backlash between the driving-side screw portion and the valve-side screw portion,
wherein pressure losses of the fluid at respective portions are so made as to satisfy a relationship of “P0≥P1≥P2”,
“P0” is a pressure loss of the fluid passing through the vaporized-fuel outlet port,
“P1” is a pressure loss of the fluid passing through an axial space formed between the valve unit and the valve seat in the condition that the valve unit is separated from the valve seat, and
“P2” is a pressure loss of the fluid passing through an axial gap formed between neighboring spring wire portions of the coil spring or passing through an axial gap formed between the coil spring and the valve seat.

13 more elements

A flow-rate control valve comprising:

a valve housing having;
(1a) a first fluid passage connected to a vaporized-fuel inlet port;
(1b) a second fluid passage connected to a vaporized-fuel outlet port;
(1c) a fluid flow path through which fluid flows from the first fluid passage to the second fluid passage;
and
(1d) a connecting space formed in the fluid flow path and operatively connecting the first fuel passage to the second fuel passage;
a valve unit movably accommodated in the valve housing in such a manner that the valve unit is operatively brought into contact with a valve seat formed in the valve housing or separated from the valve seat, wherein the valve unit closes the connecting space to prohibit a fluid flow through the connecting space or opens the connecting space to allow the fluid flow therethrough;
a driving portion for driving the valve unit in an axial direction of the valve housing in such a manner that the valve unit is reciprocated between a valve closed position and a valve opened position, wherein the valve unit is brought into contact with the valve seat in the valve closed position and separated from the valve seat in the valve opened position;
a driving-side screw portion formed in the driving portion;
a valve-side screw portion formed in the valve unit and engaged with the driving-side screw portion;
and
a coil spring provided in the fluid flow path of the connecting space and biasing the valve unit in the axial direction for absorbing a backlash between the driving-side screw portion and the valve-side screw portion,
wherein cross-sectional areas at respective portions are so made as to satisfy a relationship of “S0≤S1≤S2”,
“S0” is a cross-sectional area of the vaporized-fuel outlet port,
“S1” is a cross-sectional area of an axial space formed between the valve unit and the valve seat in the condition that the valve unit is separated from the valve seat, and
“S2” is a total of a cross-sectional area of an axial gap formed between neighboring spring wire portions of the coil spring and a cross-sectional area of an axial gap formed between the coil spring and the valve seat.

13 more elements

A flow-rate control valve comprising:

a valve housing having:
(1a) a first fluid passage connected to a vaporized-fuel inlet port;
(1b) a second fluid passage connected to a vaporized-fuel outlet port;
(1c) a fluid flow path through which fluid flows from the first fluid passage to the second fluid passage;
and
(1d) a connecting space formed in the fluid flow path and operatively connecting the first fluid passage to the second fluid passage;
a valve unit movably accommodated in the valve housing in such a manner that the valve unit is operatively brought into contact with a valve seat formed in the valve housing or separated from the valve seat, wherein the valve unit closes the connecting space to prohibit a fluid flow through the connecting space or opens the connecting space to allow the fluid flow therethrough;
a driving portion for driving the valve unit in an axial direction of the valve housing in such a manner that the valve unit is reciprocated between a valve closed position and a valve opened position, wherein the valve unit is brought into contact with the valve seat in the valve closed position and separated from the valve seat in the valve opened position;
a driving-side screw portion formed in the driving portion;
a valve-side screw portion formed in the valve unit and engaged with the driving-side screw portion;
and
a coil spring provided in the fluid flow path of the connecting space and biasing the valve unit in the axial direction for absorbing a backlash between the driving-side screw portion and the valve-side screw portion,
wherein pressure losses of the fluid at respective portions are so made as to satisfy a relationship of “P0≥P1≥P2”,
“P0” is a pressure loss of the fluid passing through the vaporized-fuel outlet port,
“P1” is a pressure loss of the fluid passing through an axial space formed between the valve unit and the valve seat in the condition that the valve unit is separated from the valve seat, and
“P2” is a pressure loss of the fluid passing through an axial gap formed between neighboring spring wire portions of the coil spring or passing through an axial gap formed between the coil spring and the valve seat,
wherein cross-sectional areas at respective portions are so made as to satisfy a relationship of “S0≤S1≤S3”,
“S0” is a cross-sectional area of the vaporized-fuel outlet port,
“S1” is a cross-sectional area of an axial space formed between the valve unit and the valve seat in the condition that the valve unit is separated from the valve seat, and
“S2” is a total of a cross-sectional area of an axial gap formed between neighboring spring wire portions of the coil spring and a cross-sectional area of an axial gap formed between the coil spring and the valve seat, and
wherein, in a first coil portion of the coil spring on a side closer to the valve seat, an axial distance between the neighboring spring wire portions is larger than an axial distance between the valve unit and the valve seat in a condition that the valve unit is separated from the valve seat at its maximum distance.

18 more elements

A flow-rate control valve comprising:

a valve housing having:
(1a) a first fluid passage connected to a vaporized-fuel inlet port;
(1b) a second fluid passage connected to a vaporized-fuel outlet port;
(1c) a fluid flow path through which fluid flows from the first fluid passage to the second fluid passage;
and
(1d) a connecting space formed in the fluid flow path and operatively connecting the first fluid passage to the second fluid passage;
a valve unit movably accommodated in the valve housing in such a manner that the valve unit is operatively brought into contact with a valve seat formed in the valve housing or separated from the valve seat, wherein the valve unit closes the connecting space to prohibit a fluid flow through the connecting space or opens the connecting space to allow the fluid flow therethrough;
a driving portion for driving the valve unit in an axial direction of the valve housing in such a manner that the valve unit is reciprocated between a valve closed position and a valve opened position, wherein the valve unit is brought into contact with the valve seat in the valve closed position and separated from the valve seat in the valve opened position;
a driving-side screw portion formed in the driving portion;
a valve-side screw portion formed in the valve unit and engaged with the driving-side screw portion;
and
a coil spring provided in the fluid flow path of the connecting space and biasing the valve unit in the axial direction for absorbing a backlash between the driving-side screw portion and the valve-side screw portion,
wherein pressure losses of the fluid at respective portions are so made as to satisfy a relationship of “P0≥P1≥P2”,
“P0” is a pressure loss of the fluid passing through the vaporized-fuel outlet port,
“P1” is a pressure loss of the fluid passing through an axial space formed between the valve unit and the valve seat in the condition that the valve unit is separated from the valve seat, and
“P2” is a pressure loss of the fluid passing through an axial gap formed between neighboring spring wire portions of the coil spring or passing through an axial gap formed between the coil spring and the valve seat, and
wherein, in a first coil portion of the coil spring on a side closer to the valve seat, an axial distance between the neighboring spring wire portions is larger than an axial distance between the valve unit and the valve seat in a condition that the valve unit is separated from the valve seat at its maximum distance.

14 more elements

A flow-rate control valve comprising:

a valve housing having:
(1a) a first fluid passage connected to a vaporized-fuel inlet port;
(1b) a second fluid passage connected to a vaporized-fuel outlet port;
(1c) a fluid flow path through which fluid flows from the first fluid passage to the second fluid passage;
and
(1d) a connecting space formed in the fluid flow path and operatively connecting the first fuel passage to the second fuel passage;
a valve unit movably accommodated in the valve housing in such a manner that the valve unit is operatively brought into contact with a valve seat formed in the valve housing or separated from the valve seat, wherein the valve unit closes the connecting space to prohibit a fluid flow through the connecting space or opens the connecting space to allow the fluid flow therethrough;
a driving portion for driving the valve unit in an axial direction of the valve housing in such a manner that the valve unit is reciprocated between a valve closed position and a valve opened position, wherein the valve unit is brought into contact with the valve seat in the valve closed position and separated from the valve seat in the valve opened position;
a driving-side screw portion formed in the driving portion;
a valve-side screw portion formed in the valve unit and engaged with the driving-side screw portion;
and
a coil spring provided in the fluid flow path of the connecting space and biasing the valve unit in the axial direction for absorbing a backlash between the driving-side screw portion and the valve-side screw portion,
wherein cross-sectional areas at respective portions are so made as to satisfy a relationship of “S0≤S1≤S2”,
“S0” is a cross-sectional area of the vaporized-fuel outlet port,
“S1” is a cross-sectional area of an axial space formed between the valve unit and the valve seat in the condition that the valve unit is separated from the valve seat, and
“S2” is a total of a cross-sectional area of an axial gap formed between neighboring spring wire portions of the coil spring and a cross-sectional area of an axial gap formed between the coil spring and the valve seat, and
wherein, in a first coil portion of the coil spring on a side closer to the valve seat, an axial distance between the neighboring spring wire portions is larger than an axial distance between the valve unit and the valve seat in a condition that the valve unit is separated from the valve seat at its maximum distance.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/264,847Filed 1 Feb 2019
Priority: JP 2018-0394646 Mar 2018
Published: US 2019/0277417 A112 Sep 2019
Granted: 15 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

Family

US 2019/0277417 A1Pre-grant publication · published 12 Sep 2019
US 10,865,902 B2This patent

From the US filing history. Foreign family members aren’t listed.

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